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Old 03-10-2010, 09:18 PM
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Anti seize on brake line fittings?

I am sick and d@mn tired of destroying brake lines and fittings every time I go to work on brakes. I am always rounding off the fittings (which are WAY too soft IMO) and usually ruin the fittings and lines in the process.

Would there be any ill effects to using some anti sieze on the threads of the flare nuts on the connections?

It took two pipe wrenches to break apart three fittings today and the forth fitting i had to cut. This is probably going to cost me god only knows how much to fix. The small 3/16" line from the rear brake splitter to the left wheel cylinder wont be too bad, but since i ruined the big line that runs from a joint just in front of the gas tank to the block in the back on the axle, it could cost me quite a bit if a new line needs to be made.

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Old 03-10-2010, 11:45 PM
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IMHO ... you need a flare wrench ...



Available at most places where decent tools are sold ( even Craftsman has them ). The wrench is designed to NOT round off and is very helpful when doing brake work.

When I make new brake lines and install them .. I sometimes use Brake fluid as a lubricant ... and I rarely ever have a problem when taking a union apart ... partly because of the wrench and the lubricant ... But I make super good flares with my hand held hydraulic flaring tools.

I have a Mastercool 71475 Flaring kit



Go here to see one ... and a video of one in operation.

http://www.mastercool.com/pages/flaring_tools.html

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Old 03-10-2010, 11:48 PM
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I used to have some of those flare tools. I dont remember having any better luck with them either... but i cant remember for sure. its been a while. I do need to invest in some more tho, the ones i had were in my tool box that was stolen last year.
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Old 03-11-2010, 01:11 AM
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I don't think there is a problem using Never Seize on the fittings. I would be careful about getting it inside the tubing however.

The right tool is excellent advice too. Sears has nice wrenches. For once in a great while use HF tools are cheap.
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Old 03-14-2010, 05:39 AM
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i never have much luck with our flare wrenches i dont evne try to use them anymore. if its rusted and seized then a flare wrench is going to round the fitting off just as any other wrench type will.

im not sure what you can use that will surivive brake fluid

yoy could try plumbers pipe dope or teflon tape

or anti seize

if brake fluid doesnt contact the threads then maybe it will last and work

good luck
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Old 03-14-2010, 12:41 PM
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One big problem is incorrectly made flares. If the tubing isn't cut square, a bad flaring technique is used, or a bad flaring tool is used, the ill-formed flare requires way too much torque on the fitting to seal.

Rarely will a hack go back and reform a poorly made flare- they will instead just crank hell out of the fitting to stop the leakage and hope for the best. Then when you come along and try to remove said over-tightened fitting, it rounds off.

A correctly made flare and undamaged fittings only require a firm tug to seal perfectly.

Being as how most brake fluid is hygroscopic, it will cause the fittings to rust if there's any leakage- as well as salt on northern roads, etc.- the brake lines and fittings at the wheels can see a lot of wear and tear under the best circumstances.
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Old 03-14-2010, 12:51 PM
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I found out the hard way while working in the marine industy about line wrenches cheap ones don't cut it , I had sears ( crapsmans ) the cheap ones you buy at harbor freight , buffalo , ect , the best I found that don't spread are the ones that snap on sells they are worth the $$ that you spend for them and never had problems breaking line nuts loose , if the nut strips and will not come loose it needed to be replaced anyways as more than likely the tube is rusted inside the nut , I use the master cool tool to do double flares , and never had a problem with a bad flare even with thick stainless tubing , even with the 37* flares for AN
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Old 03-14-2010, 09:54 PM
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No problem using never sieze. I do SS brake lines for many rodders and racers in the area and use never sieze on all fittings. Teflon tape is not good on brake lines and pipe dope a no no. Just be careful not to get in the tube so it doesn't mix with the brake fluid. As stated above the flair does the sealing not the threads.
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Old 03-14-2010, 11:51 PM
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Quote:
Originally Posted by 65ELCMO


Teflon tape is not good on brake lines and pipe dope a no no.


As stated above the flair does the sealing not the threads.
I agree ...
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Old 03-15-2010, 08:06 AM
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You are over tightening the fittings if it takes that much force to get them apart. Usually the issue with fittings is the line will seize in the fitting not the fitting seizing in the block or cylinder. I would not recommend putting anything on the threads as if it gets inside the tube it will contaminate the brake fluid and possibly damage rubber brake parts.
In a flared fitting the flare is the seal not the threads so no tape or sealer should ever be needed. A good double flare is the key and the key to a good double flare is a good flaring tool.
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Old 03-15-2010, 08:29 AM
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I have a problem with anti seize on brake fittings. It MAY be oil based and in a closed glycol fluid brake system, any type of oil based product is considered a potential problem for the seals and o-rings. The problem lies not necessarily with initial assembly but mostly with disassembly then reassembly when you can't do a perfect cleaning(it's almost impossible to even wipe it off your hands) and end up contaminating the fluid. You, as pointed out above, are probably over tightening the fittings and/or have a poor flare. As far as using tape - on any NPT (pipe thread) fittings you can use tape if there is no flare, but leave 2 threads clear.
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